Displacement and water level problem

[borys_waw]

Hi All, last time i tried to render displacement with water level (to create material for raster ceiling or enything with thicknes and holes). I based on this tutorial http://www.youtube.com/watch?v=RvOWlhZzq78 Unfortunetely I'm not able to set material to achieve proper displacement it self not to mention about water level. U can see all the problems on attached images.

As You can see in attachments:
1. displacement grow down not up.
2. edges looks very very poor
3. water level looks like some big mistake

Can somebody take a look on images and try to help me solve the problem?
Thanks in advance.

I'm allso attaching zip with scene and vismat.
http://www.mediafire.com/?mgei17j1jromj65

I use sketchup 7 on OSX and latest Vray.

[borys_waw]

Enybody there?

[andybot_cg]

Hi There!

1. The direction of the displacement depends on the orientation of your face. If the backside faces out, the displacement is negative.
2. those jagged edges are a function of the displacement settings as well as the geometry of the faces. You can make the edge length variable smaller, you will get a finer result (at a cost of increased time) Also, increased subdivisions can help too.
3. water level means that a certain depth of the map will be cut off. For example if you want to generate a net material, you can "open" holes in it by using the water level.

-Andy

[fpedrogo]

Hi
I found some issues in your scene. First the face with displacement is inverted, so all the displacement effect will be inverted. Second, in the material displacement option you have the "Use Global" option enable, so you are going to use the global setting instead of the material setting. To fix these issue, invert the face of the geometry with displacement and disable the "use Global" option. Another issue is the sub division of the geometry, in your scene the plane doesn't have any subdivision at all, it is better to subdivide the actual geometry than try to subdivide the geometry using the subdivision option on the displacement. This can produce some triangulation visual effect on your render. Then you can use the edge length to control the quality of the edges.
The jagged edges is basically the subdivision of the mesh. If you want a refine mesh you have to decrease the edge length, but this is going to increase your render time.
You can watch this other video for more help.
http://www.youtube.com/watch?v=8jPBpysrDBw

Here is the link to download the fixed scene.
http://dl.dropbox.com/u/15315718/Displacement.rar

Best

[borys_waw]

Thank You Guys. I forgot that side of face matters.

ps. fpedrogo, can You save this scene in 7 version? thanks.

[fpedrogo]

Hi
Here is the link to download the scene in SU7

http://dl.dropbox.com/u/15315718/scene_SU7.skp

Best

[nomeradona_cg]

i have not use water level but good to know about the negative face...

[andybot_cg]

I've found using the back face is helpful in a situation like brick where the mortar joints are recessed to the face. Otherwise the brick gets moved out relative to the other components (like lintels, sills, etc.)